8.8

CVE-2026-64831: ffmpeg Stack-based Buffer Overflow

CVSS: 8.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-64831DEBIAN-CVE-2026-64831CGA-2j5f-3w79-ghwv
Published 22-07-2026Last modified 28-07-2026
Open JSON

Vulnerability summary

CVE-2026-64831 is a high (CVSS 8.8) Stack-based Buffer Overflow vulnerability in ffmpeg. EPSS estimates a 0.85% chance of exploitation in the next 30 days, higher than 57.5% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.85%
0%100%
Low · +0.40 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
USN-8716-2CGA-3PXG-R7G6-X2HH

Timeline

  1. 22-07-2026
    PublishedVulnerability first disclosed.
  2. 28-07-2026
    Last modifiedVulnerability information updated.

Description

FFmpeg versions 8.0 through 8.1.2 contains a stack buffer overflow vulnerability in the Vulkan HEVC hardware decoder that allows remote attackers to overwrite return addresses and adjacent stack frames by supplying a crafted HEVC/H.265 bitstream. Attackers can embed a malicious vps_num_hrd_parameters value exceeding HEVC_MAX_SUB_LAYERS in any supported container format to overflow stack-allocated arrays in the vk_hevc_end_frame function, potentially achieving arbitrary code execution.

CVSS metrics

9 scores · 6 sources · 2 versions

EPSS trend

Probability

0.85%

Chance of exploitation in the next 30 days

Percentile

58%

Versus all other CVEs

30-day change

+0.40 pp

From 0.45% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.85%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard5 products
  • eco-python-ffmpeg-8-minimal< 8.1.3-r0
  • eco-python-ffmpeg-8-minimal-dev< 8.1.3-r0
  • eco-python-ffmpeg-8-minimal-static< 8.1.3-r0
  • ffmpeg-8.0All versions (No fix recorded)
  • ffmpeg-8.1All versions (No fix recorded)
Ubuntu2 products
  • ffmpegAll versions (No fix recorded) | < 7:8.0.1-3ubuntu2+esm4
  • libavAll versions (No fix recorded)
Wolfi2 products
  • ffmpeg-8.0All versions (No fix recorded)
  • ffmpeg-8.1All versions (No fix recorded)
Debian1 product
  • ffmpeg< 7:9.0.2-1
Ffmpeg1 product
  • ffmpeg92737390dc133daadce47dd7d2ec8ef3d9ebcbed | ≥ 8.0, ≤ 8.1.2

5 vendors · 11 products

References

10 links